Here you go, then. It should print perfectly on an 58 mm thermal printer. It features:
- 12½% grey scales (clockwise, from right) — ordered, Hilbert (clump=5), Floyd-Steinberg, and halftone (4 pixel/cell).
- Vertical and horizontal test lines.
- Classy woven background.
- Roughly 50% grey overall, so shouldn’t cause your printer too much grief.
- Entirely free of licence restrictions.
very simple python image printer: scruss/esc-pos-image.py
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